Publication: Advanced 3Y-TZP bioceramic doped with Al 2 O 3 and MnO 2 particles potentially for biomedical applications: Study on mechanical and degradation properties
Date
2018
Authors
Ragurajan D.
Golieskardi M.
Satgunam M.
Hoque M.E.
Ng A.M.H.
Ghazali M.J.
Ariffin A.K.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Editora Ltda
Abstract
The effectiveness of Al 2 O 3 and MnO 2 in enhancing mechanical properties and retarding degradation of 3 mol% yttria stabilized tetragonal zirconia polycrystalline (3Y-TZP) ceramic samples was evaluated by pressureless sintering at temperatures ranging from 1250 �C to 1550 �C with standard holding time of 2 h. It was observed that the inclusion of Al 2 O 3 and MnO 2 into 3Y-TZP was beneficial for the improvement of mechanical properties and ageing resistance. The optimum amounts of dopants were determined to be of 0.6 wt% Al 2 O 3 and 0.4 wt% MnO 2 . Microstructural investigation revealed that at the same temperature, the tetragonal grain size was not influenced by the increase of dopant levels. With optimum dopants the 3Y-TZP ceramic (density 6.1 g/cm 3 ) samples demonstrated the Vickers hardness of 11.6 GPa, fracture toughness, K IC of 9.8 MPa m 1/2 , flexural strength of 900 MPa and Young's modulus of 210 GPa. Furthermore, the efficacy of the dopants (MnO 2 and Al 2 O 3 ) in retarding low-temperature degradation of 3Y-TZP ceramic during exposure in Ringer's solution at 37 �C was also evaluated. Overall, the degradation rate and weight loss of 0.6 wt% Al 2 O 3 and 0.4 wt% MnO 2 ceramic samples were 0.66% in 8 weeks as compared to the undoped samples. The 3Y-TZP bioceramic doped with Al 2 O 3 and MnO 2 could be a potential candidate material for biomedical applications (e.g. hip implants) due to its improved mechanical properties and superior ageing resistance. � 2018 Brazilian Metallurgical, Materials and Mining Association.
Description
Alumina; Aluminum oxide; Bioceramics; Ceramic materials; Degradation; Doping (additives); Elastic moduli; Fracture toughness; Manganese oxide; Mechanical properties; Medical applications; Sintering; Temperature; Vickers hardness; Yttrium oxide; Zirconia; 3Y-TZP; Biomedical applications; Hip implants; Low-temperature degradations; Microstructural investigation; Pressure-less sintering; Ringer's solution; Yttria stabilized tetragonal zirconias; Ceramic Prosthetics